Gigabyte HPC Server cooling question?

Jan 12, 2017
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Gigabyte G482-Z50

Does anyone know, or could find out (as I think this server is pre-release), exactly how the following Gigabyte HPC server cools its CPUs? (excluding heat sinks)

As you can see there are no front chassis fans, only fans behind the GPUs and at the back of the Chassis; hence my question.

The specification back's this up by stating: "System fans: 4 x 40x40x28mm (25,000rpm) and
6 x 60x60x76mm (21,700rpm)

The product listing also states: "...ready to support the full list of AMD EPYC Rome 7002 Series processors: up to 225W (standard TDP) / 240W (cTDP)".

G482-Z50 (rev. 100) | High Performance Computing System - GIGABYTE Global

(3 pictures embedded below)




 
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Jan 12, 2017
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There are no fans behind the heatsinks eg the fan wall is in front of the CPUs, not behind it.

This is what I meant when I mentioned "excluding heat sinks"; obviously like you say passive heat sinks need air flow.
 
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Jan 12, 2017
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There are also 4 fans on the back of the chassis. Basically all the fans are pumping air into or extracing out of, the 10 GPUs.

I think the way this server may work (in terms of CPU cooling) is by using either 4U active (fan based) heatsinks, or flat/horizontal active (fan based) heatsinks; I just cant find any information on this to know either way.

I just cannot see how this could work by using normal passive heatsinks without any front chassis fans.
 
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Jan 12, 2017
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Thanks that's really useful; I hadn't realized just how much air these Gigabyte midplane fans pull in.

I did wonder about that server you reviewed (G481-s80) as it seems to have a very similar chassis to this and another Gigabyte server (G482-Z51). What made me think twice though is the server you reviewed has 12 (2 x 6) midplane fans, whereas this one only has 6.

If I am not mistaken these 2 servers (G482-Z50 and G482-Z51) are some of the only 'normal' PCIE GPU servers that feature these solely "pull air" midplane fans. All the others I have seen (Supermicro, Tyan, Asus, etc) also have the normal front chassis fans.

Perhaps enough people would wonder how the CPU cooling works on these, and its effects due to the increased air temp going into the GPUs, enough to warrant a review on these servers? (G482-Z50 or G481-s80).

If you also used the passively cooled RTX Quadro's that you just reviewed, that could add an extra level of interest.

Additionally it would also allow you to link into both of your previously articles (G481-s80 and RTX Quadro 8000).
 

Patrick

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There is the minor issue that we do not have the passively cooled Quadros in the lab nor those Gigabyte PCIe GPU severs :D

All of the GPU servers are set up as wind tunnels. The fans, no matter where they are located, push a ton of air through the chassis.

CPUs, by comparison, are populated much less densely than GPUs. With 2U/ 4U tower heatsinks, no vendor, other than Dell, has even mentioned it. See Dell DSS 8440.
 
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Jan 12, 2017
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Oh that does make doing a review kind of difficult :eek:

Thanks for the heads up on the DELL (and Inspur) 4U GPU servers; I wasn't actually aware of them.

Its actually quite interesting to see how all the different players approach the 4U 8-10 GPU server approach; and from what I see only Gigabyte are offering EPYC variants.

You'd think they would fedex you over a HPC/EPYC/Quadro setup so you could highlight this unique USP!